v2 foundation: shared contracts, app profile schema, wiring stubs

- projects: app profile columns + one app per org; project_external_git,
  deploy_targets, org_model_grants tables (migration a0f0e1d2c3b4)
- ports + fakes: RepoWorkspace, DeliveryHooks, DeployTarget, Memory,
  ModelGrants, WorkforceBootstrap; AppProfile + AppProfileRepository
- per-workstream wiring (container_org/engine/delivery), config blocks,
  empty routers, delivery worker, MCP/delivery service shells, web stubs
- admin nav derives from ADMIN_ITEMS; plan docs updated for ext4 worktrees

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

services/delivery-worker/README.md

@@ -0,0 +1,8 @@
+# delivery-worker
+
+Runs queued CI/CD pipeline runs (checkout → setup → build → test → package → demo deploy →
+healthcheck → route) and polls git remotes for pushes made outside the engine.
+Shell around `app/workers/delivery.py`. Owned by the delivery workstream; see `docs/plan/`.
+
+    pnpm worker:delivery      # one pass
+    pnpm --filter @agy/delivery-worker dev   # loop